Time-series charts in Lilaq

Questions
1

HI everyone,
This is my first interaction with this forum :)

I want to know how could i plot time-series charts using lilaq, if its is possible.

As you can guess i need datetime on x-axis and numerical values on the y-axis.

I tried converting the datetime to integer and then plotting against that but in vain.

I would prefer not to convert the datetimes to string since i also require to visualize the change in frequency in certain graphs.

This can be considered a small example which i am trying to get working and will eventually be programatically generating the graphs through an API.

#let dates = (
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 00, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 01, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 02, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 03, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 04, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 05, second: 00),
)

#let values = (5, 4, 2, 1, 2, 7)

#lq.diagram(
  title: [Time-Series Data],
  xlabel: [Date],
  ylabel: [Value],
  xticks: dates.map(d => d.display()),
  lq.plot(dates, values, mark: "o", label: [Series A]),
)

any help or guidance would be appreciated, thanks!

1 Like
2

I think there is a few things you can do. For the lq.plot you can just generate x-values in the range from zero to the length of your dates with array.range.

For the ticks, you can then sort the dates such that they correspond to the correct x-tick and display them with the xaxis parameter like here:

#import "@preview/lilaq:0.2.0" as lq 

#let dates = (
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 01, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 00, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 02, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 03, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 04, second: 00),
  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 05, second: 00),
).sorted()

#let values = (5, 4, 2, 1, 2, 7)

#lq.diagram(
  title: [Time-Series Data],
  xlabel: [Date],
  ylabel: [Value],
  xaxis: (ticks: dates.map(d => rotate(-90deg, reflow: true, d.display())).enumerate()),
  lq.plot(range(dates.len()), values, mark: "o", label: [Series A]),
)

image
image822×964 83.9 KB

1 Like
3

I would move this long part into a named closure:

#let make-label = date => rotate(-90deg, reflow: true, date.display())

and do

  xaxis: (ticks: dates.map(make-label).enumerate()),

I’ll also point out that numbers don’t need a leading zero:

  datetime(year: 2023, month: 1, day: 1, hour: 15, minute: 1, second: 0),